uint256 _marginAfterFees = _tradeInfo.margin - _handleOpenFees(_tradeInfo.asset, _tradeInfo.margin*_tradeInfo.leverage/1e18, _trader, _tigAsset, false);
uint256 _positionSize = _marginAfterFees * _tradeInfo.leverage / 1e18;
// No refferal fees are considered
_feePaid =
    _positionSize
    * (_fees.burnFees + _fees.botFees) // get total fee%
    / DIVISION_CONSTANT // divide by 100%
    + _daoFeesPaid;
uint256 _marginAfterFees =
    _tradeInfo.margin-
    _handleOpenFees(
        _tradeInfo.asset,
        _tradeInfo.margin*_tradeInfo.leverage/1e18, 
        _trader,
        _tigAsset,
        false);

// @audit Then _positionSize would be greater than what is supposed to be, allowing to create a position greater than expected
uint256 _positionSize = _marginAfterFees * _tradeInfo.leverage / 1e18;
// In _handleOpenFees function
+   uint256 _refFeesToConsider = _referrer == address(0) ? 0 : _fees.referralFees;
    _feePaid =
        _positionSize
-       * (_fees.burnFees + _fees.botFees) // get total fee%
+       * (_fees.burnFees + _fees.botFees + _refFeesToConsider) // get total fee%
        / DIVISION_CONSTANT // divide by 100%
        + _daoFeesPaid;
